AN LTT IMPROVISED A TAXIWAY WHEN IT FOUND THAT IT HAD MISSED A TAXIWAY. THERE WAS CONSTRUCTION GOING ON.

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GND CTL TOLD US TO MAKE A L TURN ON 'I;' THEN A R TURN AT T6 TO TRANSITION TO L DUE TO CONSTRUCTION AT T6 AND THEN MAKE A L TURN BACK TO I AND PROCEED TO 20L. THE CAPT UNDERSTOOD THE CLRNC AND PROCEEDED TO TAXI THE ACFT. AS PNF; AND NO QUESTIONS FROM CAPT; I PROCEEDED TO FINISH THE MANIFEST AND FIGURE THE TKOF SPDS. OUR COMPANY PROC USES A RADIO CLOSEOUT TO RECEIVE BAG WTS; AND INSTRUCTS US TO COMPLETE THE LOAD MANIFEST AWAY FROM CONGESTED TERMINAL AREAS; IE; TAXIWAYS. NORMALLY THIS TAKES 2-3 MINS TO COMPLETE MANIFEST; COMPUTE WT AND BAL; AND FIGURE TKOF SPDS. UNFORTUNATELY; DURING THIS TIME; THE PNF IS UNABLE TO MONITOR TAXI PROCESS. IN MY SITUATION; THE CAPT INADVERTENTLY MISSED THE L TURN BACK TO I. AT THIS POINT; I FINISHED FIGURING TKOF SPDS AND LOOKED UP TO SEE THAT WE JUST PASSED THE INTXN TO TURN BACK TO I ON. NEXT THE CAPT SAW WHAT HE THOUGHT WAS ANOTHER TAXIWAY BTWN I AND L. IT IN FACT WAS AN UNMARKERED SVC ROAD FOR THE FIRE HOUSE N OF I. THE CAPT STARTED TO TURN TOWARD IT AND I TOLD HIM THAT IT LOOKED TOO NARROW AND THAT I DIDN'T THINK IT WAS A TAXIWAY. THE CAPT SAID 'OH WELL ITS TOO LATE NOW' AND TAXIED ACROSS WITH NO PROBLEMS. THE TAXIWAY WAS JUST WIDE ENOUGH FOR OUR ACFT. IN RETROSPECT I FEEL 2 FACTORS CONTRIBUTED TO THIS OCCURRENCE. 1) COMPANY PROC AND POLICY USING RADIO CLOSEOUT AFTER LEAVING GATE; THAT REQUIRES PNF TO DO 'PAPERWORK' WHILE CAPT TAXIES THE PLANE. I BELIEVE THAT IF THE COMPANY HAD ALLOWED US TO FINISH OUR CLOSEOUT AT THE GATE; THIS SITUATION WOULD NEVER HAD OCCURRED. 2) MY COMPLETE SURPRISE; WHEN THE CAPT REALIZED HE MISSED THE TURN THAT HE DID NOT STOP THE PLANE AND ASK ME TO CALL GND AND ASK FOR ASSISTANCE AND INSTRUCTIONS. INSTEAD; AS THE CAPT WAS ABOUT TO TELL WHAT HE PLANNED TO DO; HE DID IT WITHOUT CONSULTING ME. WHEN ONE MEMBER OF THE CREW MAKES AN EMBARRASSING MISTAKE; WE EXPECT HIM OR HER TO COME FORWARD AND TELL US IN ORDER TO KEEP US INFORMED OF THE OTHERS PLANS OR ACTIONS.